43 lines
855 B
Go
43 lines
855 B
Go
|
// +build freebsd netbsd openbsd dragonfly solaris
|
||
|
|
|
||
|
|
package machineid
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bytes"
|
||
|
|
"os"
|
||
|
|
)
|
||
|
|
|
||
|
|
const hostidPath = "/etc/hostid"
|
||
|
|
|
||
|
|
// machineID returns the uuid specified at `/etc/hostid`.
|
||
|
|
// If the returned value is empty, the uuid from a call to `kenv -q smbios.system.uuid` is returned.
|
||
|
|
// If there is an error an empty string is returned.
|
||
|
|
func machineID() (string, error) {
|
||
|
|
id, err := readHostid()
|
||
|
|
if err != nil {
|
||
|
|
// try fallback
|
||
|
|
id, err = readKenv()
|
||
|
|
}
|
||
|
|
if err != nil {
|
||
|
|
return "", err
|
||
|
|
}
|
||
|
|
return id, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func readHostid() (string, error) {
|
||
|
|
buf, err := readFile(hostidPath)
|
||
|
|
if err != nil {
|
||
|
|
return "", err
|
||
|
|
}
|
||
|
|
return trim(string(buf)), nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func readKenv() (string, error) {
|
||
|
|
buf := &bytes.Buffer{}
|
||
|
|
err := run(buf, os.Stderr, "kenv", "-q", "smbios.system.uuid")
|
||
|
|
if err != nil {
|
||
|
|
return "", err
|
||
|
|
}
|
||
|
|
return trim(buf.String()), nil
|
||
|
|
}
|